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Finding the Fourth Proportional to 20,791.85, 28,692.64 and 11,360.41

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Solution

The fourth proportional to 20,791.85, 28,692.64 and 11,360.41 is: 15,677.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791.85 : 28,692.64 = 11,360.41 : x
  2. Step 2: Convert to fraction form
    20,791.85/28,692.64 = 11,360.41/x
  3. Step 3: Cross multiply
    20,791.85x = 28,692.64 × 11,360.41
  4. Step 4: Simplify right side
    20,791.85x = 325,960,154.38
  5. Step 5: Solve for x
    x = 325,960,154.38/20,791.85
  6. Step 6: Final answer
    x = 15,677.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.